Number of nuclei taking part in double fertilization is

Options

A. Two
B. Three
C. Four
D. Five

Answer

**Step-by-Step Solution:**

1. **Understanding Double Fertilization**: Double fertilization is a unique process that occurs in angiosperms (flowering plants). It involves the fusion of two male gametes with two different structures in the ovule.

2. **Identifying the Gametes**: In double fertilization, one male gamete (sperm) fuses with the egg cell to form the zygote. This is the first fertilization event.

3. **Fusing with the Central Cell**: The second male gamete fuses with the central cell, which contains two polar nuclei. This fusion results in the formation of the triploid endosperm, which nourishes the developing embryo.

4. **Counting the Nuclei**: In total, there are:
- 1 nucleus from the egg cell (which combines with one male gamete)
- 2 nuclei from the central cell (the two polar nuclei that combine with the second male gamete)
- 2 nuclei from the two male gametes.

Thus, the total number of nuclei involved in double fertilization is 1 (from the egg) + 2 (from the central cell) + 2 (from the male gametes) = 5 nuclei.

5. **Conclusion**: Therefore, the number of nuclei taking part in double fertilization is 5.

**Final Answer**: The number of nuclei taking part in double fertilization is 5.

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